Weaver s shuttle



UNITED STATES PATENT OFFICE.

WILLIAM MARKLAND AND JOSEPH MILNES, OF LOWELL, MASSACHUSETTS.

WEAVER S SHUTTLE.

Specification of Letters Patent No. 7,687, dated October 1, 1850.

To all whom t may concern:

Be it known that we, -VILLIAM MARK- LAND and JOSEPH MILNEs, both ofLowell, in the county of Middlesex and State of Massachusetts, haveinvented new and useful Improvements in Weavers Shuttles; and we dohereby declare the following to be a full and exact description of thesame and the principle or character which distinguishes them from allother things before known or used, reference being had to accompanyingdrawings, making a part of this specification, in which- Figure 1, is alongitudinal section through t-he shuttle and Fig. 2, a plan of theshuttle as it is usually introduced between the warps.

The same letters indicate the same part in each of the ligures.

In our improved shuttle, we employ the spindle its hinge spring &c. tosupport and 4secure the bobbin, such as are common in shuttles. The yarnpasses from the bobbin toward one end of the shuttle between two metalsurfaces which are compressed toward each other by a spring and therebycause friction between themselves and the yarn, which friction acts todetain and retard the yarn from passing; then out at a proper opening inthe side of the shuttle to be delivered to the cloth.

The first part of our invention consists in the arrangement and positionof the lever forming one of the friction surfaces, by which arrangementthe irregular strain upon the yarn caused in ordinary shuttles is to agreat degree avoided.

The second part of our invention consists in the construction andpeculiar combination of the spring which compresses the metallicfriction surfaces upon the yarn.

In the accompanying drawings (A) represents the full bobbin of yarn. Theyarn (B) proceeding from it, passes around the friction lever (C)bet-Ween which and the friction post (D) it is compressed. The lever (C)vibrates upon the fulcrum pin (G) which is so placed that the vibrationsof the lever (C) are to-ward and from the bobbin and is forced upon theyarn by the spring From between these friction surfaces the yarn passesout through a hole in the side of the shuttle to be delivered to thecloth.

We are aware that friction caused by the compression of metallic andother surfaces upon the yarn by springs has been before used and thatcertain constructions have been before patented-but in no one of theseconstructions has the friction lever been arranged to vibrate from andtoward the bobbin of yarn. In the shuttles vhaving a leverwhich'vibrates in any other direction than from and toward the bobbinthe friction upon the yarn between the surfaces always remains the same,and if the yarn is by any means caught upon the bobbin or hindered 1nany way from an even delivery, the strain upon the yarn becomes greaterthan it should be. But in our improved shuttle if the yarn is detainedupon the bobbin or in any way caught in it-s passage from the bobbin tothe friction lever the direction of the yarn (B) and the movement of thelever (C) are such that the lever (C) will be lifted from its seat bythe yarn and the friction of the yarn caused by compression between thefriction lever (C) and the friction post (D) will cease to exist.Thereby giving, by their combined action, a compensating apparatus, inwhich, if the yarn comes from the bobbin freely, then a suiiicientamount of friction is given by the compression between the lever (C) andthe friction post (D) to deliver the yarn to the web ata proper tension.If the yarn does not come from the bobbin freely, then the friction bycompression ceases, as the requisite amount of tension already exists.

The spring (E) is made of thin steel and has one end resting upon` theshuttle and the other end resting upon the lever (C), between itsfulcrum and its friction surface. A screw F passes through the middle ofthe spring and is supported by the wood forming the end of the shuttle,by this screw the amount of friction is adjust-ed. That part of thefriction lever upon which the spring rests is made by its form to actlike a cam, as it turns upon its fulcrum, and in the present drawings isshown as made so that when the lever is lifted a short distance from itsseat, the end of the spring is allowed to fall, and the power eX- ertedupon the lever is less than when it is fully down. This is so arranged,in o-rder that, when the lever is once lifted it may be more easilyretained. In case of using yarns of unequal size in its different parts,and it was required to draw the yarn tighter, when the largest partswere delivered to the cloth: The cam part of the lever upon which thespring rests should be made to raise the spring and thereby produce byit a great-er effect, as the lever is lifted from its seat. Theseoperations may be seen by reference to drawings on Sheet 2, which showtwo forms of levers. Fig. l, being that in which, as the friction leverC, is raised from its seat the spring gives more eect upon the yarn. Theposition of the lever and spring when the lever is raised, is shown inred lines, and it is apparent that the spring E, will press moreeffectually than Ywhen the lever is down upon the friction post D.

In Fig. 2 the part of the lever C, upon which the spring rests is ofsuch form, as may be seen from the two positions shown, that the eect ofthe spring is no more when the lever is raised to its highest point thanwhen it is upon the friction post. y

Having thus fully described our inven- WILLIAM MARKLAND. JOSEPH MILNES.

Witnesses:

THOMAS A. BEARD, JOHN MILNES.

